If you remove one from eleven, it becomes ten. If you remove one from nine, it becomes ten.

How is this possible?

Nine marbles are arranged in the image below. Can you slide two marbles to form a square?

You need to move three matchsticks to form three squares. Can you do it?

I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

In an interview, a boy was asked an unusual question 'How two persons sitting with a table in between them can't see each other?' He was unable to reply. Can you?

A shepherd had 18 sheep, out of which, all but ten died.

Can you tell us how many sheep was he left with?

Imagine you are in a room with no windows or doors. How will you get out?

I look flat, but I am deep. Hidden realms I shelter. Lives I take, but the food I offer. At times I am beautiful. I can be calm, angry, and turbulent. I have no heart but offer pleasure as well as death. No man can own me, yet I encompass what all men must have. What am I?

Which country gets ill every time?

Considering the below equation:

V + II - VI = 10
IV - X + VIII = 20
IV - VII + VI = 30

Then, I + II + III = ?